FARMINGTON — A man is in critical condition at San Juan Regional Medical Center after a cell phone tower in Little Water fell on him Sunday. Sammy Pacheco, 51, was working on the tower, about 23 miles south of Shiprock, when the crane holding the tower let go, allowing it to topple over, a family member said Monday.Pacheco fell 40 feet, and the tower crushed him, likely damaging his brain, puncturing his lung, and causing severe injuries to much of his body, the family said. San Juan Regional Medical Center spokeswoman Kathryn Pettijohn confirmed Monday that Air Care transported him to the hospital Sunday.